WO2000050796A1 - Detection de position pour vannes de regulation rotatives - Google Patents

Detection de position pour vannes de regulation rotatives Download PDF

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Publication number
WO2000050796A1
WO2000050796A1 PCT/US2000/001851 US0001851W WO0050796A1 WO 2000050796 A1 WO2000050796 A1 WO 2000050796A1 US 0001851 W US0001851 W US 0001851W WO 0050796 A1 WO0050796 A1 WO 0050796A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
magnetic field
valve shaft
sensor
angular position
Prior art date
Application number
PCT/US2000/001851
Other languages
English (en)
Inventor
Lawrence R. Lafler
Douglas J. Tanner
Val Dieuliis
Vernon M. Cottles
Original Assignee
Spx Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spx Corporation filed Critical Spx Corporation
Priority to CA 2362252 priority Critical patent/CA2362252C/fr
Priority to EP00905728A priority patent/EP1163466A4/fr
Priority to AU27368/00A priority patent/AU2736800A/en
Publication of WO2000050796A1 publication Critical patent/WO2000050796A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0033—Electrical or magnetic means using a permanent magnet, e.g. in combination with a reed relays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical

Definitions

  • This invention pertains generally to methods and devices for sensing angular positions and, more particularly, to methods and devices for detecting and providing feedback of the angular position of a rotary control valve.
  • Rotary control valves such as butterfly valves or ball valves, include a valve body and a plate, ball, or other flow control member rotatably mounted in the valve body to either block fluid flow through the valve, or allow fluid flow through the valve, depending upon the angular position of the flow control member.
  • a ball valve includes a ball which is securely mounted to upper and lower portions of a valve shaft. The ball is mounted in the fluid flow path of the valve by mounting the lower portion of the valve shaft in a lower portion of the valve body and the upper portion of the valve shaft in an upper portion of the valve body, with the ball positioned between the upper and lower shaft portions in the fluid flow path of the valve.
  • An actuator is attached to the upper portion of the valve shaft, which extends through the valve body. When the actuator is turned, the valve shaft, and, therefore, the
  • valve ball (Docket No. 26942) valve ball, is rotated.
  • the ball is shaped, i.e., portions of the ball are removed or grooves are formed therein, such that when the ball is rotated, through, e.g., 90°, the fluid flow path through the valve is gradually opened or closed.
  • Sensing the angular position of the valve may be accomplished by attaching an angular position sensor to the valve actuator.
  • magnets may be attached to the rotating member of the valve actuator, and a Hall effect sensor used to determine the position of the actuator as the actuator member, therefore, the magnets attached thereto, is rotated.
  • the magnetic field produced by the magnets attached to the actuator is also rotated.
  • the Hall sensor is placed within the magnetic field produced by the magnets. As the direction of the magnetic field changes, as the actuator is rotated, the Hall effect sensor detects the change and provides a signal from which the rotary position of the actuator can be determined.
  • a cam may be attached to the actuator shaft.
  • the angular position of the actuator shaft is then converted to an electrical signal by an inductive sensor connected or in close proximity to the cam.
  • the cam attached thereto is also rotated, which, in turn, changes the inductance of the inductive sensor in contact with or in close proximity to the cam.
  • a signal is provided by the inductive sensor which is related to the angular position of the actuator and from which the angular position of the actuator can be determined.
  • a potentiometer may be connected to the rotating member of the valve actuator. As the actuator member is rotated, the potentiometer potential is changed. This change in potential can be detected and signal derived therefrom from which the angular position of the actuator can be determined.
  • the angular position sensing methods described above have been employed to sense the position of the lower portion of the valve shaft which is directly connected to the flow control member. Since the shaft is directly and tightly connected to the flow control member, sensing the angular position of the shaft will result in an accurate determination of the angular position of the flow control member itself. Any of the angular position sensing methods described above may be used to determine the angular position of the valve shaft.
  • a magnet may be attached to the lower portion of the valve shaft, and a Hall sensor placed near the magnet. As the valve shaft, and, therefore, the flow control member itself, rotates, the magnetic field produced by the magnet attached to the valve shaft changes direction. This change in direction is detected by the Hall effect sensor, which provides a signal related to the angular position of the angular shaft member from which the angular position of the flow control member can be determined accurately.
  • a potentiometer can be attached to the lower portion of the valve shaft. As the shaft, and, therefore, the flow control member itself, is rotated, the potential of the potentiometer is changed. This change can be sensed, and a signal provided from which the angular position of the flow control member can be determined accurately.
  • the potentiometer or other device for sensing angular position of the shaft may be extended through an aperture in the valve body near the end of the shaft.
  • a potentiometer may be mounted on the outside of the valve body.
  • An elongated shaft attached to the potentiometer may be extended through an aperture in the valve body wall and be connected to the lower portion of the valve shaft.
  • a Hall effect device may be mounted within the valve body, near a magnet placed on the flow control member or lower portion of the valve shaft, with conducting wires for conducting the signal provided by the Hall effect sensor passing through a hole in the valve body. In either case, the addition of another aperture to the valve body provides another potential leak path from the valve, and therefore, adversely affects valve integrity.
  • the present invention provides for accurate detection of the angular position of a valve flow control member in a rotary control valve using magnets mounted in the bottom end of the lower portion of a valve shaft, which is tightly connected to the flow control member, and a magnetic field sensor, mounted outside of the valve pressure boundary, for detecting changes in the magnetic field produced by the magnets as the valve flow control member is rotated. Since, in this manner, the angular position of the lower valve shaft is determined directly, and since the lower valve shaft is tightly connected to the flow control member, the present invention provides a highly accurate determination of the angular position of the valve flow control member.
  • angular position detection in accordance with the present invention employs magnets which are mounted entirely within the valve, and a magnetic field sensor which is mounted entirely outside of the valve, the present invention allows accurate angular position detection to be achieved without the need for providing another hole through the valve, which would add another leak path from the valve, require additional packing, and make the valve more fragile.
  • a rotary control valve in accordance with a first embodiment of the present invention, includes a ball, disk, or other flow control member, which is tightly connected to a valve shaft.
  • the lower portion of the valve shaft is mounted on the inside of a lower portion of the valve wall.
  • the lower portion of the valve shaft is made of a nonmagnetic material, and has two magnets retained in cavities formed on each side of and extending parallel to the axis of rotation of the valve shaft. The magnets are oriented such that the north pole of one of the magnets and the south pole of the other magnet are near the bottom end of the valve shaft.
  • a plate of ferrous material may be used to connect the other, upper, ends of the magnets through an opening in the valve shaft which extends between the cavities in which the magnets are retained.
  • the purpose of the plate of ferrous material is to increase the strength of the magnetic field created between the lower ends of the magnets near the bottom of the lower portion of the valve shaft.
  • An arching magnetic field is thus produced between the lower poles of the magnets at the bottom of the lower portion of the valve shaft. This arching magnetic field extends beyond the end of the valve shaft, and through the lower portion of the valve wall that is in close proximity to the end of the shaft.
  • the lower portion of the valve wall penetrated by the magnetic field is made of a non-magnetic material.
  • a magnetic field sensor such as a giant magneto resistive (GMR) sensor or a Hall effect sensor, is placed in the magnetic field created by the magnets on the outside, or unpressurized side, of the non-magnetic lower portion of the valve wall.
  • the output signal provided by the magnetic field sensor is dependent on the strength and direction of the magnetic field in which the sensor is placed.
  • a sensor signal provided by the magnetic field sensor varies as the angular position of the magnets mounted in the lower portion of the valve shaft varies.
  • the signal produced by the magnetic field sensor indicates the angular position of the valve flow control member.
  • the sensor signal produced by the magnetic field sensor can be converted by a signal conditioner into an analog or digital signal format. This signal can be processed and transmitted to a position attached to or near the valve for accurate control of the valve flow control member position, and/or can be displayed at a local or remote location.
  • the lower valve shaft which is tightly connected to the valve flow control member, contains a cylindrical opening formed therein extending from the bottom of the shaft and centered on the axis of rotation of the shaft. Magnets are placed in two recesses formed in the shaft on opposite sides of the cylindrical opening. The magnets are placed in the recesses such that opposite poles point toward each other across the cylindrical opening to create a magnetic field within the cylindrical opening.
  • a lower portion of the valve wall is formed to include an extension which extends into the cylindrical opening in the lower valve shaft.
  • This lower portion of the valve wall is made of a non-magnetic material.
  • a cavity is formed in the extending portion of this non-magnetic lower portion of the valve wall, on the outside of the valve wall, such that the magnetic field produced by the magnets in the valve shaft is also present within the cavity.
  • a magnetic field sensor such as a magneto-resistive sensor or a Hall effect sensor is placed in the magnetic field within the cavity.
  • the magnetic field sensor produces a sensor signal which is dependent on the strength and direction of the magnetic field in which the sensor is mounted.
  • the sensor signal provided by the magnetic field sensor varies as the angular position of the magnets mounted in the valve shaft changes.
  • the sensor signal provided by the magnetic field sensor provides an accurate indication of the angular position of the valve flow control member.
  • the sensor signal can be converted by a signal conditioner into any analog or digital format, processed, and transmitted to a position attached to or near the valve to accurately control the position of the valve flow control member, and/or to the local or remote location for display.
  • the accuracy of rotary valve angular position detection in accordance with the present invention is improved by making the detection of the angular position of the valve flow control member insensitive to temperature changes in the magnets mounted in the lower valve shaft and the magnetic field strength sensor employed. This is achieved by using two magnetic field sensors mounted on the outside of the lower portion of the valve wall within the magnetic field produced by the magnets mounted in the lower valve shaft.
  • the magnetic field sensors are mounted on the valve such that the active axes of the two sensors are oriented in the same plane but angularly displaced from each other.
  • the angular position of the valve flow control member can be calculated in a manner in which the first order dependence of position signal versus temperature is canceled out.
  • the angular position of a flow control member in a rotary control valve can be determined under various temperature conditions.
  • Fig. 1 is an illustration, in cross-section, of an exemplary rotary control valve including angular position detection in accordance with the present invention.
  • Fig. 2 is a detailed side view, in partial cross-section, of a portion of an exemplary rotary control valve incorporating position detection in accordance with a first embodiment of the present invention.
  • Fig. 3 is a bottom view of the portion of the exemplary rotary control valve of Fig. 2.
  • Fig.4 is a detailed illustration, in partial cross-section, of a portion of an exemplary rotary control valve incorporating angular position detection in accordance with a second embodiment of the present invention.
  • Fig. 5 illustrates the preferred angular relationship between the active axes of two magnetic field sensors used for temperature insensitive angular position detection of a rotary control valve in accordance with the present invention.
  • Fig. 6 is a graph of exemplary output voltage profiles for two magnetic field sensors used for temperature insensitive angular position detection in accordance with the present invention.
  • the present invention provides accurate position detection for a rotary control valve.
  • the present invention may be applied to any type of rotary control valve, such as a ball valve, a butterfly valve, or a plug valve, having any type of rotatable flow control member, such as a ball, disk, or plug.
  • a ball valve such as a ball valve, a butterfly valve, or a plug valve
  • rotatable flow control member such as a ball, disk, or plug.
  • the present invention will be described with reference to application to a ball type rotary control valve.
  • the exemplary rotary control valve 10 includes a valve body 12 having a fluid flow path 14 therethrough.
  • a rotatable flow control member 16 in this case a ball, is mounted within the valve body 12 in the fluid flow path 14 of the valve 10.
  • the ball 16 is rotatable, e.g., through 90° arc, between fully open and fully closed positions. In the fully closed position, as illustrated in Fig. 1 , the ball 16 entirely blocks the fluid flow path 14 through the valve 10.
  • the ball 16 is mounted on a valve shaft having upper 18 and lower 20 portions.
  • the upper 18 and lower 20 portions of the valve shaft are, in turn, mounted in the valve body 12 for rotational movement therein.
  • the valve shaft 18 extends through the upper portion of the valve body 12. Packing 24 is placed around the valve shaft 18 where it extends through the valve body 12, to prevent leakage from the inside of the valve to the outside thereof around the shaft 18.
  • the shaft 18 is rotated, either by hand or by some other mechanism, the ball 16 is rotated to open and close the fluid flow path 14 through the valve 10.
  • the lower portion 20 of the valve shaft is tightly coupled to the valve ball 16. Therefore, the angular position of the valve ball 16 can be determined accurately from the angular position of the lower portion 20 of the valve shaft.
  • accurate position detection of the valve ball 16 is achieved, therefore, by mounting magnets 26 in the lower portion 20 of the valve shaft.
  • the magnets 26 are mounted in the lower portion 20 of the valve shaft so as to create a magnetic field which extends outside of the valve body 12.
  • the lower portion of the valve shaft 20 and a lower portion 28 of the valve body 12 are made of non-magnetic materials which do not interfere with the magnetic field created by the magnets 26.
  • the non-magnetic lower portion 28 of the valve body 12 may be formed as a separate piece of non-magnetic material which is tightly attached, via bolts 29, screws, or another mechanism to the bottom of the valve body 12 adjacent the lower portion 20 of the valve shaft.
  • a magnetic field sensor 30 is mounted on the outside or within a cavity of the non-magnetic portion 28 of the valve body 12, within the magnetic field created by the magnets 26.
  • the magnetic field sensor 30 may be implemented as a Hall effect sensor, or as a magneto-resistive sensor, such as a GMR sensor manufactured and sold by Non-Volatile Electronics, Inc. of Eden Prairie, Minnesota.
  • the magnetic field sensor 30 produces an output signal which depends on the strength and direction of the magnetic field passing through the sensor.
  • the magnetic field produced by the magnets 26 mounted in the lower portion of the valve shaft 20 also rotates, and the sensor signal provided by the magnetic field sensor 30 varies with the angular position of the magnets 26.
  • the signal produced by the magnetic field sensor indicates the angular position of the valve ball 16.
  • the sensor signal produced by the magnetic field sensor 30 may be converted by a signal conditioner into any analog or digital format which may be processed and/or displayed in a conventional manner.
  • Figs. 2 and 3 illustrate, in more detail and by example, the mounting of the magnets 26 in the lower portion 20 of the valve shaft in an exemplary embodiment of the present invention.
  • the lower valve shaft 20 which is made of a non-magnetic material, has two magnets 26a and 26b mounted therein in parallel cavities formed near the bottom end of the lower valve shaft 20.
  • the two magnets 26a and 26b are thus mounted in the lower portion of the valve shaft 20 in parallel both with each other and with the axis of rotation of the valve shaft.
  • the magnets 26a and 26b are oriented such that the north pole of one of the magnets and the south pole of the other of the magnets are nearest the end of the lower portion of the valve shaft 20.
  • a plate of ferrous material may be mounted in the lower portion 20 of the valve shaft to connect the other, upper ends of the magnets 26a and 26b together.
  • the piece of ferrous material 27 acts to increase the strength of the magnetic field produced between the lower ends of the magnets 26a and 26b.
  • the magnets 26a and 26b produce an arcing magnetic field between their lower poles. This arcing magnetic field extends beyond the end of the lower portion of the valve shaft 20 and into or through the non-magnetic lower portion 28 of the valve body 12.
  • the magnetic field sensor 30 is mounted either within or on the non-magnetic lower portion 28 of the valve body, within the arcing magnetic field produced by the magnets 26a and 26b. As discussed previously, as the lower portion of the valve shaft 20 is rotated, the magnetic field produced by the magnets 26a and 26b is also rotated. As the direction of the magnetic field changes, the output signal produced by the magnetic field strength sensor 30 also changes. Since the lower portion of the valve shaft 20 is tightly connected to the valve ball 16, the angular position of the valve ball 16 can be accurately determined from the signal produced by the magnetic field strength sensor 30.
  • the signal produced by the magnetic field strength sensor 30 may be provided on a line 32 to a remote processor and/or display system, wherein the angular position of the valve ball 16 may be displayed to a user and/or may be used as feedback to an automated mechanism for opening and closing the valve ball 16 via a valve shaft 18.
  • FIG. 1 An alternative exemplary embodiment of a rotary control valve incorporating angular position detection in accordance with the present invention is illustrated in and will be described in detail with reference to Fig.4.
  • the lower portion of the valve shaft 20 which is made of a non- magnetic material and which is tightly connected to the valve ball, has a cylindrical opening 34 formed therein extending from the bottom of the lower portion of the valve shaft 20 and centered on the axis of rotation of the lower portion of the valve shaft 20.
  • Two magnets 26a and 26b are mounted in recesses on opposite sides of the lower portion of the valve shaft 20.
  • the magnets 26a and 26b are mounted in the lower portion of the valve shaft 20 such that opposite poles of the magnets 26a and 26b point toward each other across the cylindrical opening 34 in the valve shaft 20, to create a magnetic field within the cylindrical opening 34.
  • the extending portion 36 of the lower portion of the valve body 28 forms a cavity on the outside of the valve body which also extends into the cylindrical opening 34 formed in the lower portion of the valve shaft 20, such that the magnetic field created by the magnets 26a and 26b is present in this cavity.
  • the magnetic field sensor 30 is mounted within this cavity, on the outside of the valve body, within the magnetic field created by the magnets 26a and 26b. As discussed previously, as the valve ball, and, therefore, the lower portion of the valve shaft 20 is rotated, a signal provided by the sensor 30 will vary as the direction of the magnetic field detected by the sensor 30 changes. As described previously, this signal may be processed and displayed in a conventional manner, and/or used as feedback to control an automatic valve control mechanism connected to the valve shaft.
  • the angular position signal provided by the magnetic field sensor 30 is sensitive to changes in temperature in the magnets 26 mounted in the lower portion of the valve shaft 20, and changes in temperature of the sensor
  • the two magnetic field sensors preferably are mounted such that their active axes are aligned at equal angles between 0 and 45° on opposite sides of the halfway angle of rotation (e.g., 45°) of the lower portion of the valve shaft.
  • the first sensor is oriented at some angle, ⁇ .,, between 0° and 45°.
  • the second sensor is oriented at an angle ⁇ 2 , between 45° and 90°.
  • valve angle As the valve ball is rotated, the direction of the magnetic field with respect to the active axes of the magnetic field sensors changes.
  • exemplary output voltages for the two sensors as the valve angle changes from 0° to 90° are illustrated in the profile of Fig. 10.
  • the alignment of the two sensors in the manner described avoids the zero field condition, which is a problem region in some magnetic field sensors, such as magneto-resistive sensors.
  • the valve angle From the output signals provided by the two magnetic field sensors, the valve angle can be calculated.
  • a mathematical derivation of the valve angle as a function of two sensor voltages uses the following relationships for the two sensor voltages:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Une vanne de commande rotative (10) comporte un élément de régulation de flux (16) ayant un arbre inférieur (20) logé rotatif dans une partie de corps non magnétique(28). Un aimant (26) est couplé à l'arbre inférieur (20) de vanne et peut tourner avec ce dernier de manière à produire un champ magnétique externe qui est fonction de la position angulaire de l'élément de régulation du flux (16). Un détecteur de champ magnétique (30) est mis en oeuvre pour détecter le champ magnétique externe et pour produire des signaux de position représentatifs de ce champ. Ce détecteur fournit ainsi une indication de la position angulaire de l'élément de régulation du flux (16).
PCT/US2000/001851 1999-02-23 2000-01-26 Detection de position pour vannes de regulation rotatives WO2000050796A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA 2362252 CA2362252C (fr) 1999-02-23 2000-01-26 Detection de position pour vannes de regulation rotatives
EP00905728A EP1163466A4 (fr) 1999-02-23 2000-01-26 Detection de position pour vannes de regulation rotatives
AU27368/00A AU2736800A (en) 1999-02-23 2000-01-26 Position detection for rotary control valves

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/256,050 1999-02-23
US09/256,050 US6244296B1 (en) 1999-02-23 1999-02-23 Position detection for rotary control valves

Publications (1)

Publication Number Publication Date
WO2000050796A1 true WO2000050796A1 (fr) 2000-08-31

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ID=22970918

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/001851 WO2000050796A1 (fr) 1999-02-23 2000-01-26 Detection de position pour vannes de regulation rotatives

Country Status (5)

Country Link
US (2) US6244296B1 (fr)
EP (1) EP1163466A4 (fr)
AU (1) AU2736800A (fr)
CA (1) CA2362252C (fr)
WO (1) WO2000050796A1 (fr)

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AU2736800A (en) 2000-09-14
CA2362252C (fr) 2005-01-11
US6484751B2 (en) 2002-11-26
EP1163466A1 (fr) 2001-12-19
CA2362252A1 (fr) 2000-08-31
EP1163466A4 (fr) 2004-04-07
US6244296B1 (en) 2001-06-12
US20010027812A1 (en) 2001-10-11

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